Use ubuntu for docker runtime image (#161)

The Alpine base image causes systematic crash for some libsecp256k1
operations. JNI-related issues related to the use of `musl` instead of
`glibc` are well documented.

The issue is fixed by switching alpine for ubuntu, which is
`glibc`-based. Note that it makes the final image significantly larger
(502MB vs 313MB).

The goal of using the JVM on docker was for compatibility with ARM. Once
we support native ARM on Linux (#157), we could potentially move back to
Alpine with native phoenixd, an even smaller footprint than before.

Fixes #159.

Author: pm47

.docker/Dockerfile

@@ -18,17 +18,17 @@ RUN git clone --recursive --single-branch --branch ${PHOENIXD_BRANCH} -c advice.
     && test `git rev-parse HEAD` = ${PHOENIXD_COMMIT_HASH} || exit 1 \
     && ./gradlew distTar
 
-# Alpine image to minimize final image size
-FROM eclipse-temurin:21-jre-alpine as FINAL
+# JRE image to minimize final image size
+FROM eclipse-temurin:21-jre-jammy as FINAL
 
 # Upgrade all packages and install dependencies
-RUN apk update \
-    && apk upgrade --no-interactive
-RUN apk add --update --no-cache bash
+RUN apt-get update \
+    && apt-get upgrade -y
+RUN apt-get install -y --no-install-recommends bash
 
 # Create a phoenix group and user
-RUN addgroup -S phoenix -g 1000 \
-    && adduser -S phoenix -G phoenix -u 1000 -h /phoenix
+RUN addgroup --system phoenix --gid 1000 \
+    && adduser --system phoenix --ingroup phoenix --uid 1000 --home /phoenix
 USER phoenix
 
 # Unpack the release